Nomad Interceptor wasn't some kind of a special ship or anything, in fact even equipment was a typical one. In missions where they were spawned the game added normal nomad fighter wings and then next moment replaced their names with "Nomad Interceptor" string, so you saw them like that. Apart from that the only difference is that in some cases they were given a more aggressive AI routines, so they'd basically kept following you regardless of distance and didn't fall back. Other than that there is nothing special about 'em.
